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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b27c232fe6dfe68a5f4a096b6714945f0cee5f4737f654a2eb78b5a0b2949572' 
  AND token = 'H88pCtl/K6xXgXPSJwuhD16wVUppyX3ssphNo6k2bCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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