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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7815a0275467f8c73550e4363ecaffc70ec19ea4d42f327cf7ea3c3484d47f06' 
  AND token = '/BYGCXuXCY/A/R6JuuntQOe/2s0JhJTl1t70TbKiMgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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