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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc840f3a4471433b1db6c8e1c89d3e34e5dae16ac6605047dadeb631c0eb1be1' 
  AND token = 'ort8l9FdWEFog/pKiLHblJU4Pp3sg4o5oxPF7VdQSjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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