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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6dd6461a69dddcb1e91fcbbf8685863181f514b09c118a874a16d233773bc35' 
  AND token = 'MGi7/eIR8uv8EAOkUEFK3kKEpZmHDFHVsLZRHa09Utc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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