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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f87b0c023c8821921ae25220312cad809a63f23dcbca8aec32b0ec6dc0aff75b' 
  AND token = 'RNdPQJVKnPE5A6c3oP3da7SnGcMM5uaL7HiRPA0qISk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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