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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a0c341f0888597453da114d436d80d32b633e2d31dfe901a39a38fad0e2735a' 
  AND token = 'fuNCtU2J2OKZVzIeBJX0E+aXmn/y55w8yj4bdoAFEiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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