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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa9e055419c72f5fd7b139619e3f186d27a44e590f4ec8672732ff4b6bb403e2' 
  AND token = 'rd6Plo0HgJtl99I1vLSTSmgJDmFTa/4FRnANoY6S3S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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