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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5f9de0e4596d0ffc519896cc8dcfdabb0346d85489f713e2d175277b7f1fe8e' 
  AND token = 'XFog0PfCCls6tBQ+gbYu0E81nzdAy3ov6HquAc4CntE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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