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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '089ba86869348b2f96d0e426a4ddc4387052f2c13726e42fd623126684c2ae85' 
  AND token = 'ebCWXnKVLleIaG+zaSGOM1/w5FCTo1EZpha91cjIua8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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