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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f76ceaddc15cb61bd290a1288e386f66949eed4659083bc73784ed38d902ddb' 
  AND token = 'wpHLW0DUQ9QZg15dysCEyVCynX0hUBeu2Eb3oC8l+kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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