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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a01fd2918cde75dd686169a89306ee70f9de38c62fb7c44d3e22a0e7f1068faa' 
  AND token = 'IRthC2SD1Nz/axMWKv2Khz4dWjQ5Uj/qp3y8++O6TF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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