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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb792bdfdee87954cb81259a922fcba13c5e8831c09f5d1e0c9ccd3c45bf810b' 
  AND token = 'ifoQnRGYzZDq8OuUl5FsWWm2oyuNeHO2SeafNoJF3f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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