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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '305a5db7e9f7d84b2949bf60c011eceaf9f820068145702826af41f8db5c2f1f' 
  AND token = 'YNcO85UfNZcoZqv7lUVGJ6J7ZpTRX8f+JBoGLp26x5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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