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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2651970b8544fabb11dddc34f9db08a4a1fe2a700508aa3fe0aa49b245e862bc' 
  AND token = 'aBvFHZ0NBUjtCok3Wu0RCkL+Xr0ha6Yuyb07I9LPJYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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