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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53bdf2649095159ff62688625fcc417693935eacc0a84ef0510560838fcd23e8' 
  AND token = 'RsgVaiHwTXUnsOa+FSVHpOvb70w04i9J3rSih0ksCCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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