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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e85c58c6c572531b67e5f3a306f6b880a46c23e45188b07bb47e113807d5e5da' 
  AND token = '4E+0dYyfwx5wYlbRgHAaL3DcVd3B05dHJAKxS6TV3DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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