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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0d74f2ff2d2095f4da0bb9706337b7b246c44875f98a483aa7f676616e8733b' 
  AND token = '4UjNgUQUT1i+7VWGOAl+dU3zz8AgkgKqNc6KEi30je8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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