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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3a3d52afb613c920b51001d75e53b837378d595332b3df0ec3d27873921b69a' 
  AND token = 'iFg7sz4nNCY3SiskjljISbwX7p6eksvC9z9sK36uKC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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