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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '803e0a34f02aca00b16c8494e7b9d1f3f01b378938ff9d9155f08b757f4b9a56' 
  AND token = '0YXQI1HoGKD6v3AcKQeQF/uEAp07zFj12DmozPzDIHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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