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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07a3361eef0bb98bb38c57334e8c2b20653ed22f14af7d5778cc77b0f9af7eac' 
  AND token = 'y3Afm02fiialkLFJaxS5kAfigYtVo65YNMl/9KxDiFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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