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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9510e9f7e97e6034a87409ac5a276063845ba0a68c7145a3170caad537b092c3' 
  AND token = 'kVnPO0CxH+GQkxSIRk/AvVKhf6s3NzUCkecgfVTA/98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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