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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1043620fc95dde577875009b064979b534cde24ca3c773e2b3087d7b22765fb' 
  AND token = 'jMTXuAEy0yd/Dd6aO/KXeQuLj2ug+viAgivUyDyF/LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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