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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5e6d3c0d8d650377605605c96c2c5ace729594aeb195fddab44e01673bf81e2' 
  AND token = 'iWw/fRIa4V9ZkWs/6E76lFScFEn1ybpousxNSnXEwBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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