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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06ea36945548e65fb1b275f9bc81f0c17e18ebadd51182ed0da0a9d49bd7732d' 
  AND token = 'Dn+d+QhMnqSq3mVGNscEea2fZZQdAhqnHDCuuiTa9TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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