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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '756c60b33ed4dfdfcc19c7378498785893d6d136e44daab6152a622d31fefada' 
  AND token = 'F32vG7M6QurXIArubh2y2sCLLljPg5fLhl5HAogkqZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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