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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04d640ae0832ec7b2cf151b2e4f4623f333cee32c60c2396f4ce309f4a030c05' 
  AND token = 'z1cjhFDFHOf7yn/dOGb7WhmKb0D/BgmJMTl6h1rQ3oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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