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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d9426811ff80a6d6aec2ef74cb22fa9de8d9b3c1978cb48957c2232bf3b8373' 
  AND token = 'gvGrpfqf/Sm6Dkmy5UmT110Wap1iWg2InIV1Dnc7gn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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