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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acc8b6723277574fd667264b962a2054f1d54d56dbb66fbc6e0a546a86501386' 
  AND token = 'shsFHRwe2WyTe0ZAnWpaKZwJeo8+R/Dub1wexyWj4fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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