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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd76ddbf4f16238b44567e97f01360faa305d72582c7952a0cb67af4f287c20ea' 
  AND token = 'qQeejNEYgsCW28ifc3q8eb/XS1yVFAuP2y4XiSktqbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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