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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d5caded88122b40455f2e41061ad2e501d04a02b25a791d9dba304fd0a12bdf' 
  AND token = 'Fd7TO9TIzh3HgJj+NKS1taEuHdqPw6QAiQi1QVtAeJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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