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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e341f81a6794ddf709aeb308f5e8bf90e6b8f212b6557bc31f4b8f713c467ab' 
  AND token = 'eAS9vSZf8N5szGAEOFAbspKOyChcqZnaPC11hTFD//o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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