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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '391c6492420f7100aafbd424274c4f2a8dbfc222e7545a3e104df199bd0de522' 
  AND token = 's3caTO3dodx7NyaJf62Y9Pz5FFqTZVrmVuF6Ck7b/qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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