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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2095f775a33ab7b185314ce0fbe760e78c8a797b010fd7467626add7a1098803' 
  AND token = 'deGb3ynyNKZIFFJ5Jiob5Swnek+Mk82RCJ3Shc2i5E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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