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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce9e3dc41009a7ac44d1f85ecc7d580b1e8fd97caf7605bff3dcee204c814d40' 
  AND token = 'NLI7gqQujoChPUAqYjKYOJOlzNC4LuljPz69lk/ncs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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