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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1ded9b5a2e42a801a7e95970f99a6b1f0bc8c230763298eeaf16892a31f3e81' 
  AND token = 'rpGEz6mNO5iZ1IUxeyYULaBGwhLSjUC9FnPNTBrmpk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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