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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed2e2a81d6231698e25d86b5d79daf01f03b880d1ca99af97c04d94ef0d7232a' 
  AND token = 'I98Vl2rRH/sne1e0LG8VAhIP6oDVfkrcmI+o3tAvIdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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