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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da5b8d39356ed3dcc68968f97875c9d1c9828e3c7a8927a8067e5b0b7c09a05a' 
  AND token = 'GuFOCLUyxhPYb6ACA9G7PRE6mcGS2RitjdismEUjOU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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