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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '456988926c839224d4285c929e545f030dc259d856bf58c3114a7653b4945169' 
  AND token = 'tFCtjIzb5eOM/z55QgAPM+mbMV/OEq3Hy7AM9cli5AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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