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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0c1936335efac4b0ca799b62429826bf7e24548f9b11464f5a05c6bbc5e9202' 
  AND token = 'Q5EMOncrH/HQnPXgQubc6jcEyJWFW71mFRs8zMGqaV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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