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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7aa0a94f8abc04a91d33afea2b8b799d786844f5f97688c25d6afc9ffeb86a64' 
  AND token = 'aG+pJTjbcNC2RefT2K9duCIlAc/5ATKVJxNF7s5BpSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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