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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d5615f1610a7b290e3ec84c46047266ae8557caaebaec295dfaa23e618844bc' 
  AND token = 'x9XZuY8YxEGl/i4UuV2GrLdPkTmiy2OP1kfUZciQick=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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