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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '423e00932f26e324573eb117283a8022e06c7e9ec7500e20a3f93b805b99ebab' 
  AND token = 'F7nf86751+wv7qWBETr1086lVz0/lXUtaSm7Fkxtrxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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