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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9dc25ada1b3870df8aef077e90dcba7bec091974bf4f305fc84abdb3e526cf5' 
  AND token = 'mb6i9ZMv8gVKPhxJKDtynW+FRmtAkPRYC30aKP9IQ3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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