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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94b2cdcbec61d0418c55ad62317fe317fc1fa0c52a1e8ea5a7e982a6201d822a' 
  AND token = '0+egdBxf7I5uhA/+M6CbEO4WL1GUWarCXXL1XpT0/x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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