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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87fd5ed09351e9679906ba408438a212b745defe17d5ff3c3d9d3d9b44d8d758' 
  AND token = '0g8btIu2pONU5mqyMjeMhPIXx1uhbmdixE7YPBmiHkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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