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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dcdcb30a078f85ead9092893d1ac43acdf07465a391ca51bf59500bb15085bf' 
  AND token = 'Xrq1t/wfoWQeSSzuh4JIlRSMVNlEi4gqu6H0VoDQP6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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