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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9a84cf870ec89be07dada7f54905fc31289aaa2f20b9612f0b7867615b793f0' 
  AND token = 'vimGrbrL4nVMM3C3f0ro4OyrgjJWELCeEVCQ02wCS1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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