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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e57d6bfb32bc5b83b41dc719633ea43e729db48ec3a2825e4b49d94e521136b' 
  AND token = '+MkCaew4RdLYLBvmMY8MeuGKnKw2VEAkj574VAGdOJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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