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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '175455eefe81cf75db42099dac0debc42caf9b0d16b492a9ff53838cb3a9433d' 
  AND token = 'IAgXDP1sEl09TpvKi+loB3QkHDBiDIltBJeX6cgPu0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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