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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e134c60a62ad5d1b048a3fc81ffa00c0d90ecae421589de3f3320f49317aaf01' 
  AND token = 'akPfZJBzkLx1G9BEmLVTDqNdpXEJR7GniWBDnYfliSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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