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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1565e4667528fe27965f20e43b543128334cd5b926eb08dc2dc1d51a6d70a92a' 
  AND token = 'N1cVtE+WNQllexYsT8j2uWVQeiiobTWtes2jKjDFLFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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