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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f18c56c081ad0181ee2dfa20cdcc0ba1f55c65159a669abb42ac13fed29e094d' 
  AND token = 'eNKMDPQCPWSdavHT6cFghxqTXVSYdtGScwD+TQELeBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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