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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f946bd86e748ad2f920f696e5a3e1ee5689748c111c3b14676c7ffda895ed7e0' 
  AND token = 'OWZkGshNQjpm0EcFSkrYXFnTvDaor3gq10+XTRsf/cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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