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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a941c55ff38604292fd30cc16f282ca8151c727bdf05aacb61deac0f94530edb' 
  AND token = '9Ak+N92PcdzHr7H53bwf+1+kcA3CV7WV7Gr4UCRiwJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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