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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db2331248ba4305d791e2ffc5806935be6971d892fc10a67edb951ed35421887' 
  AND token = 'EQ7bIgIiutot+U4U21OjH8WUNujPukCd75BUIa6KGXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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