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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48e28bb62d94f1d2bfbff5a9f3398da6a6b3cc0cedaf32724f8bc8c1cebcc9c2' 
  AND token = 'jtA55B1/72ia2bxjoA/ltRjLMmzcPAF0S6UFiAFneGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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