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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83d5d286d8719bed4d7d57f29d12521a4f1a7c5b84a1aeb86286cb9c5431a21d' 
  AND token = 'lhejHOeDy5G4LnJ1gUtLBu4esWo19la3Ud/BwZ98ph0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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