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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4df6500810a854ea03b4a0471f3de319cc21dd8ab5f4a3f6d7d0948c4ea6f374' 
  AND token = 'B/jZoJdWT23/wyWxsD4bCNGA2Wr91NxYYpxYG5P6i/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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