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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a75ce05592e62335025557bbe455518264550fb311f4c7b1117f602865ebffd8' 
  AND token = 'ckgHFxpnAKuI8MCtlTY6W3SrhMBRl8/ybdL3O42fi9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}