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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cde03b9583a94b7bb6d1c96ebf494b0d4ce98614c73ea736301aed1f78c1daf' 
  AND token = 'Ohmnkc6gtNWeIug8ZbxN6xqc/Lj0ejRS15rW/a4ABmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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